2. fecund. Productive,fertile,fruitful,prolific apply to the generative aspect of something. Productive refers to a generative source of continuing activity: productive soil; a productive influence.Fertile applies to that in which seeds, literal or figurative, take root: fertile soil; a fertile imagination.Fruitful refers to that which has already produced and is capable of further production: fruitful soil, discovery, theory.Prolific means highly productive: a prolific farm, writer.